phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4fb473abe1326a2aa852623b3c09c51b', -1, 1635309893, 1635309893, '03e58e5b', -7, 0, 0)

Line : 187
File : sessions.php